Demountable-drill-bit grinder



J. MAICKEL May 10 1927.

DEMOUNTABLE DRILL BIT GRINDER Filed Jan. 14, 1926 4 Sheets-Sheet 1awww/go I NNN. l lv \w\ l v 7 w@ @y G @w 1 o.. x w uw., f@ NW. .SW w A.

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May 10 1927.

J. MAICKEL DEMOUNTABLE DRILL BIT GRINDER Filed J'n. 14. 192s 4sheets-sheet 2 May l0 1927.

J. MAICKEL DEMOUNTABLE DRILL BIT @BINDER Filed Jan. 14, 1926 4Sheets-Sheet 3 gwn/vento@ atboimgo.

Ma 10 1927. y J. MAlcKEl.

DEMOUNTABLE DRILL BIT GRINDER Filed Jan. 14, 192e 4 Sheets-Sheet 4Patented May io, 1927.

JOSEPH IACKEL, OF BUTTE, MONTANA.

nEnoUNTaBLn-DRILL-Brr GRINDEB.

Application med January '14, 1928. Serial No. 81,221.

This invention relates to improvements in holding apparatus from theopposite side grinding apparatus, and more particularly to turretmachines for dressing demountable drill bits.

.One of the objects of this invention is t0 provide an apparatuswh'ichis automatic in operation, and successively indexes or advances itselfto present the drill bits in succession to the abrasive Wheel fordressing.

The power for s uch automatic indexing 1s derived from the same shaftwhich effects' the feeding between the bit and the abrasive wheel whenthese are in dressing relation.`

TheV turret head is held in indexed position during such feeding andbetween indexing operations, to assure that drill bit is held ininvariable positionduring dressing. Y

Y an le.

Another object is to provide a simple an effective work feeding andtranslating mechanism which moves the successive vdrill bits with`regard to the abrasive Wheel to assure a uniform dressing of thecutting edge of each bit as presented. 4An adjustment is provided 'sothat the bits-may be ground to any desired gauge; and so that the drillbits may be dressed atany desired n further object is to provide asimple mechanism for rotating the turret head for indexing, andsimultaneously rotating the drill bit holders to present theiredges tothe abrasive Wheel. Thismechanism is controlled by a constantly rotatingcam which at stated intervals causes the Imovement of the turret head,and between these intervals Iholds the turret head out of engagementwith its indexing devices and effects the Afeeding of the positioneddrill bit with regard to the abrasive wheel.

Another object is to provide drill holding devices which areautomaticall alined during insertion into the turret ead, so that theapparatus may be attended tively unskilled operator.

With these yand other objects in view as will appear in the course ofthe following specification and on the` accompanyin drawings, there isillustrated therein one orm of execution of an apparatus constructed'and arranged according In the drawings:

Figure 1 is a side elevation of the operative parts of the drill bitholding apparatus and abrasive wheel in position for Fig. 2 is a sideelevation of the drill bit by a relato the present invention.

any suitable drive. A-guard 13 is provided of the usual type. The upperpart o'f the stand 10 hasv a horizontal table let` thereon, and thesupporting bracket 15 to carry the overhanging ledge 16.

YThe drill holder'proper is mounted upon l a sliding bed 17 which hasdepending flanges to receive andbe moved lengthwise upon a V-guide 18 onthe table 14, and may be' moved into any desired position thereon by thespindle 19, which at its threaded inner end 20, engages the upstandingnut 21 which is rigidly secured to the top of the V-guide 18 by thebolts 22. A\suitable handle may be mountedv onA the outer end 23 of thespindle, and used to rotate the threaded portion 20, so that theintermediate collars .24 on the spindle cause the slide 17 to .bemovedback and forth. One side of the V-guide may be tightened by `set screws100 to lock the device in adj usted position.

Journalled in the upstanding brackets 24 of this sliding bed 17 is ashaft 25, which carries thereon a cam disk `26 having a circular lowportion 27 on its periphery followed by aquick rise 28, then a slow rise29 extendingfor a major' portion of the peri hery of the cam, andfollowed by a q'uic drop 30 back to the circular dwell 27. The machineis driven by a belt passing over the pulley 2l which is mounted rigidlyby the pins 38. At their upper ends, these f arms 37 carry thespindle'39, which is pinned at. 4t) to move with the arms. rl`he spindle39 has a collar 41 thereon which is held in position by the threading 42upon the spindle (Fig. 4).

'lhe turret head comprising the body 43 having the peripheral gear teeth44 thereon, is received over the spindle 39, and is jo'urlnaled withregard to this spindle by the roller bearings 45 and 46. The turret body43 is assured against longitudinal movement upon the spindle 39 by thespacing collar 47, the gear 48 and the bowl 49, which are tightly keyedby the feather 50 in a rigid positionupon the spindle 39. It is apparentthat the turret body 43 can rotate freely about this spindle, and isheld in the invariable longitudinal position thereon which may beadjusted by the threaded engagement of the collar 41 with the threads42.

Mounted in each of a plurality ot' inclined bore holes 51 in the spindleare the sleeves 52 which are carried for easy rotation within the bodyof the turret head by the ball -bearings 53 and 54. Each of thesesleeves 52 is convergent toward the axial line of the spindle 39 and isso arranged as to present the respective drill bits in proper positionVwith regard to the grinding wheel 11, when one of v-these drill bits,for example, B in Fig. 4, is mounted upon a carrier S which is receivedtightly within the sleeve 52 by its stem portion At the other end of thestem 55 is provided al longitudinal slot 56 opening from the end of thestem, which receives the pin 57 carried by the sleeve 52: theconjunction of the slot 56 and the pin 57 assures the proper alinementof the drill bit with regard lto the t'urret head at. all times. The nut58 serves to clamp the sleeve tightly with regard to its individual gear59 and the race 60 of the ball bearing 54. A suitable key may beprovided between gear 59 and sleeve Each of theindividual gears 59meshes with the gear 48, which latter is' held stationary, and hence theindividual .sleeves 52 and therewith the drill holder carriers are givena partial rotation at each successive movement of the turret body 43.

At the outer end of the spindle 39 adjacent the carriers S is provided auniversal pivot or ball head 61 to receive a sleeve 62 on the end of acontrol -rod 63, which at its other bifurcated end 64, extends past thecam disk 26 and has the fingers 65, 65 received on either side of theshaft 25 to guide the control rod 63 in a substantially lineardirection. roller 66 is pivoted in this control rod 63 and rests againstthe periphery of the cam disk 26.

As the cam disk is rotated from the driving pulley 21 of the machine, asdescribed above, and if the roller 66 is resting uponthe supporting ear8()a mames the drill bit B against the edge of the grindl ing wheel 11.As the cam 26 continues to -rotate in the direction of the arrow in Fig.

1, the slight rise of the surface 29 of the cam will cause the controlrod 63 to be moved gradually a slight distance toward the left in Fig.1, and cause the grinding away of the edge of the drill bit. Whenthevcam 26 has rotated so far that the roller 66 drops down the surface30 of the cam, the turret head and therewith the drill bit B isWithdrawn by gravity from the grinding wheel, and at the same time, thegear teeth 44 on the periphery of the turret head, are moved intoengagement with the teeth 67` of a gear keyed on the shaft 25 drivenfromthe pulley 31 of themachine. As the shaft 25 continues to rotate, theteeth 67 eifect indexing by a partial rotation of the. turret head whichcontinues until the roller 66 and therewith the control rod 63 areforced toward the left by the quick-risev surface 28 of the cam 26. Inthis way, the teeth 67 and 44 are quickly moved out of mesh, and thenext drill bit is indexed and presented to the grinding wheel4 andslowly, moved inwardly toward this wheel by the slow-rise surface 29 ofthe cam. This action continues until all of thedrill bits have been iground upon all their edges.

ln order to lock the Fturret head 43 in po sition during each individualgrinding, a

latch lever 70 is carried upon the slide 17 by a pivot bolt 71,`andcarries at its end opposite the turret head the locking -pawl 72 whichis received successively in the notches 73, 73 in the edge of the collar74 on the turret head 43. ln order to hold this pawl 72 in lockingengagement, the link 75 is articulated at 76a to the lower end ot' therock lever 70; This link 75 has a'collar 76 against which acts the coilspring 77, to force the link 75 toward the right in Fig. 2, and therebyto hold the pawl 72 in its designated position. The tension upon spring77 and lock nut 79 which are received in theA and which at the sainetime form a guide for the free end of the link 75. When the turret headis caused to rotate by the meshing of the teeth 44 and 67, the inclinedsurface at 1 one side of the notches 73 causes the pawl 72 to ride outof the notch and slide along the periphery of the collar 74, and thendrop into the next succeeding notch. Since, at this moment, the risesurface 28 of the cam engages the roller 66 and causes the gears to bemoved out of mesh, the pawl 72 is again enabled to hold the turret headin its fixed position by engagement with the substantially radialsurface of the notch.

fastened to the slide 17,

and engages between the -cheek .plates 87l carried upon `the'shaft Thesecheek plates 87 are supported atI a distance apart Y approximating thediameter of the pin 86,

so that as the shaft-85 rotates, the shaft 36 is caused to slide backand forth in a direction at right angles to the axis of the shaft 85 bya distance approximating twice the eccentricity of the pin 86.

'lhe stems 55 of the carriers S each have a groove 90, at their free'end which, when the stem is inserted within the turret head, engagearound the edge l91 of the bowl 49. This bowl 49 is secured to .the gear48 b the cap screws 92, and in this way and the feather 50 is heldrigidly with regard to the arms 37, and against rotation. As the turrethead 43 revolves about the spindle 39, the spindles 52 rotate, but thestems 55 are held in position since the edge 91 of the bowl engages in.the grooves 90 of each of the stems. In order to enable the stems to 'bereadily 'inserted in and withdrawn from the apparatus, a part of theedge 91 of the bowl is cut away, and the latch 93 is pivoted at 94 uponthe bowl.

The thickness of the latch is the same as the thickness of theed e 91vof the bowl, as

shown in Fig. 4, so t at the grooves 90 mayA 'slide freely upon it. Thefree end of the against the actionof the coil s ring 97, and

the turret head is rotated until the stem 55 of one of the individualspindles is brought opposite the gap ,injhe edge 91 of the bowl,whereupon the stem '55 may be forced forward and out of the sleeve 52.

It is apparent' that by a proper design of the gear ratios between thegears 48 and 59, the apparatus may beV adjusted for drill bits havingdifferent numbers.. of faces, and the amount of cut may be regplated bythe slow rise 29 on cam 26. Furt ermore; the angle of grinding the bitedge may be adjusted or established by determining the relative anglesof the axis of the shaft 39 and the axes Y of the respective spindles52; and different turret heads with different angles may be provided forthe different cuts to beinade.

In the particular example shown in Fig. 4,

the angle of the spindle is placed at approximately 10 with regard tothe axis of the shaft 39, and the offset angle of the drill the spindleslie in a plane with the axis of the shaft 39. In theparticular examplevset forth, the spindle gears have 28 teeth and are in mesh with thefixed gear 48 which has 63 teeth. Y

The spindle gears therefore rotate 2% times each time they revolve aboutthe fixed gear 48, and i-n this wise the successive facesare presentedin rotation to the abrasive wheel.

By designing the gear transmission from gear 67 to gear 44, the turrethead may be caused to rotate constantly, and a conical `face be groundsuccessively upon all of the bits, as the turret gear is then held inconstant mesh with its driving gear. p

Although the device has been illustrated as applied to drill bits of aparticular shape, it will be understood that by a proper design -of thespindles and the holding sleeves, drill bits having'any number of facetsand shape of face may be ground with this grinder. It is apparent thatthe apparatus is ,not limited to the specific arrangement, sizes andproportions illustrated, but may be modiiied within the scope of theappended claims. ,l I claim:- i 1. The combination with an abrasivewheel, a plurality of work holders, means to successively present saidholders individually to the abrasive wheel at a predetermined angle andthereafter to remove the same and present another said holder thereto,said means servlng further to later Irepresent said first holder to theabrasive wheel at a different predetermined angle, and means to'advancesaid holders toward the surface of the wheel when presented bit isapproximately 10 likewise. It may -be pointed out that it is notnecessary that thereto to effect a dressing of the presented article.

2. In combination with abrasive wheel, a plurality of dr-ill bit hlders, means to successively present said holxders individually to theperipheryofthe grinding wheel at a predetermined angle, means to advancesaid holders towards the surface of said to effect a dressing of thepresented bit, and

Y means to alternately and intermittently actuate saidv presenting andadvancing means.

4. ln combination with an abrasive wheel, a turret head, a plurality ofdrill bit holders mounted in said head, means to index said turret headto successively present individual drill bits secured in said holders tosaid wheel at a predeterminedf angle, means to move said turret headtowards said wheel to effect a dressing of the presented bit, means toalternately and intermittently actuate said presenting and advancingrmeans, and means to reciprocate said turret head with regard to saidwheel during the dressine'.

In combination with an abrasive wheel, a turret head, a plurality ofdrill bit holders mounted in said head, means to index said turret headto successively present individual drill b1ts secured 1n said holders tosaid wheel at a predetermined angle, means to cause said turret headtomove towards said f wheel to effect a dressing ofthe presented bit andaway from said wheel to effect the withdrawal of said bit after dressingis completed, and means to alternately and intermittent-ly aetuate saidpresenting and advancing means.

G. ln combination with an abrasive wheel, a turret and an article holderrotatable therein, means to intermittently rotate said turret andtherewith said holder to present the latter at successively varyingpredetermined angles to said wheel, and means to feed said holder towardand withdraw it from said wheel during the quiescent intervals of saidturret.

7. ln combination with an abrasive wheel,

two drill holders each having a drilll bit mounted thereon, means to-present one of said holders and the drill bit thereon to said wheel ata predetermined angle, mechanism to move said holder and the drill bitthereon towards said wheel to effeetdressing of one surface of said bitand to withdraw said bit and holder after such dressing, and devicescoordinating the movement of said presenting means and moving mechanismto actuate said means after withdrawal of the bit and holder and topresent said other holder and bit to said wheel at the samepredetermined angle and thereupon to actuate said mechanism to move saidother holder and bit to effect dressing thereof, said devices actuatingsaid mechanism thereafter to withdraw said other holder and to causepresentation of said first holder to said wheel at a differentpredetermined angle and thereupon to actuate said mechanism to move saidholder and bit to effect dressing of another surface of said drill bit.

8. ln combination with an abrasive wheel, a turret head having aplurality of drill bit holders thereon, means to index said mamesJturret head to present a holder with the drill bit thereon to `saidwheel at a predetermined angle, means to move said turret head towardssaid wheel to effect dressing of the presented bit and to withdraw saidturret head after completion of said dressing, and mechanism tocoordinate said means whereby said indexing means effects presentationof another of said holders upon withdrawal of said head.

9. ln a drill bit grindingr device for abrasive wheels,a turret head, aplurality of drill bit holders mounted thereon, devices to rotate saidholders during the indexing of said turret head, means to index saidturret head to present said holders successively opposite said wheel,means to hold said turret head against rotational movement betweenindexing movements. mechanism to reciprocate said turret head withregard to the abrasive wheel, and means to feed said turret .towardssaid abrasive wheel.

10. ln a drill bit grinding devicefor use with, abrasive wheels, asliding "shat't` rock armscarried with said shaft, a turret headjournalled on said rock arms, a plurality of drill bit holders carriedon said turret head, means to rock said shaft and arms at predeterminedintervals toward and away from said wheel, and means operative in theposition of said rock arms away from said wheel to index said turrethead.

11. ln a drillv bit grinding .device for use with abrasive wheels,asliding shaft, rock arms carried with said shaft, a turret headjournalled on said-rock arms, a plurality of drill bit holders carriedon said turret head, means to rock said shaft and arms at predeterminedintervals toward and away from said wheel', and means to effect alengthwise movement of said shaft.

12. ln a drill bit grinding device for use with an abrasive wheel, aturret head andl rotated with said cam, gear teeth on said turret headand adapted to mesh with said gear in the withdrawn position for the indexing movement of said turret head.y

13. ln a turret head for a drill bit grinding device, a body, aplurality of rotatable sleeves mounted therein, means for* individuallyrotating said sleeves duringthe indexing of said turret head and holdingsuch sleeves against rotation except during such indexing movement ofthe turret head, a drill bit holding spindle having alengthwise slot in,one end and a peripheral groove, a pin in each of said sleeves toengage said slot to' determine the alinement of said spindle with regardto said sleeve, and means to engage said slot to hold said spindle inSaid sleeve. p

14. In a turret head for a drill bit grinding device, a rotatable body,a plurality of .rotatable sleeves mounted therein, a gear on each ofsaid sleeves, a stationary gear meshing with said sleeve gears, adrillbit holding spindle having a peripheral groove and adapted to bereceived in any of said sleeves, a stationary bowl having a rim toengage said groove and thereby hold said spindle againstremoval.l

15. ln a turret rinding device for use with an abrasive W ee1a turrethead and a plurality of Work holders thereon, a constantly rotating cam,a gear driven with said cam, gear teeth carried by said turret head,

and devices actuated bysaid cam to bring said gear teeth atintervals'into mesh with said gear to effect an indexing of saidturrethead and to move said gear teeth outof mesh after such indexing.

16. lin a turret grinding device for use with an abrasive wheel, aturret head and a plurality of work holders journalled thereon, means tosupport said turret head for movement toward and from said Wheel, alconstantly rotating cam, a gear driven with said cam, gear teeth on saidturret head, and

devices actuated by said cam to withdraw said turret head from saidWheel at intervals and bring said teeth into mesh with said gear toindex said turret head and to move said turret head toward said wheelafter indexing and to move said gear teeth out of mesh with said gear. lv

17. in a turret grinding device for use with an abrasive wheel, a turrethead and a plurality of work holders journalled thereon,`means tosupport said turret head for -movementtoward and frolnlsaid wheel, a

constantly rotating cam, a gear driven with said cam, gear teeth on saidturret head,

devices actuated by said cam to withdraw said turret head from saidwheel at intervals and bring said teeth into mesh with said gear toindex said turret head and to move said turret head toward said wheel'after indexing and to move said gear teeth out of mesh with said gear,and thereafter to feed said turret head towards said wheel for dressingsaid work.

18. lin a turret grinding vdevice for use A with an abrasive wheel, aturret head and a plurality of worh holders journalled thereon, a gearon each of said workholders, a

gear held relatively stationary with. regard to said turret head andmeshin of said work holder gears, an devices to edect an indexing ofsaid turret head at intervals and thereby rotate said work holders tosuccessively resent different surfaces of the work to sai `Wheel.

19. lin a turret grinding device Yfor use with an abrasive wheel, a mainshaft, a cam shaft driven from said main shaft. .a

vsaid turret head for movement towar with each cam and a gear on 'saidcam shaft, a work v traversing shaft driven from said main shaft, a rockshaft and rock arms carried thereby, a turret head carried onsaid rockarms, devices on said traversin shaft to effect av longitudinal movemento said rock shaft and the elements carried thereon, gear teeth on saidturret head, and devices actuated by said cam to move said gear teethinto mesh with said gear to index the turret head and thereafter to movesaid gear teeth out of mesh withsaid ear.

21. In a turret grinding evice for. use

with an abrasive wheel, a main shaft, a

work traversing shaft driven fromA said main shaft, a turret head, meansto su por;

an from said wheel, means actuated from said main shaft to move saidturret head toward 4and from said wheel, and devices actuated from saidwork traversing shaft to move said4 turret head longitudinally.

22. In a turret head, a lurality of sleeves journalled for rotation terein, a plurality of work holder spindles adapted to be re-v ceived insaid sleeves, each of said spindles havin a peripheral groove therein,and a retaimng bowl held stationary relatively to said turret head andhaving its rim ada ted to roject into each of said grooves to old saispnidles against withdrawal.

23. ln a turret head, a lurality of sleeves journalled for rotation thof work holder spindles adapted to be received in said sleeves, each ofsaid spindles having a peripheral groove therein, a retaining bowlhaving its rim adapted to pro.

ject into each of said grooves, and havin a portion of said rim cutaway, and a late member to fill said cut-away portion and complete thesaid rim.

ceived in said sleeves, each o said spindles having a longitudinal slotat its end, and

a pin in each of said sleeves to be receiredv -in oneof said slots toaline the respective spindle in said sleeve. o

n testimony whereof, I aliix my signa JOSEPH 'MAICKEL 24. In a turrethead, a lurality of sleeves i journalled for rotation t erein, apluralityV of work holder spindles ada ted to be re los erein, aplurality l

